Hi, does anyone know how fast the reverse charging is and what standards it uses?
I assume its just the standard USB 5V 3A, but would be disappointed if it was limited to 5V 500mA.
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Can I use a 2.1a cigarette plug on the N7? Or can someone recommend a suitable car charger (dual usb)?
Sent from my Nexus S 4G using Tapatalk 2
As long as the voltage output is correct it sgould be fine. I reckon 2.1Amp is plenty. I've not had much luck with 2Amp+ cigarette lighter adaptors, the few I've had have always ended up causing radio interference.
y, voltage matters much.
I've got a dual-output cig plug that has a 1A port and a 2.1A port. On my N7, it charges fine off the 1A port but doesn't charge at all off the 2.1A port.
For comparison, from the 2.1A port my Galaxy Nexus phone only recognizes it as "USB charging" so only pulls 500ma. 2.1A usually means it's got the special ipad circuitry and most other stuff won't pull more that 500ma from it. I stick to 1A chargers now.
From a purely electrical stand point the amps is less important then the voltage. You simply always need a supply with more amps then your device will draw. Unlike voltage where you do not want to have a difference in the number as long as the amps number is higher you're fine. If you have extra amps it doesn't use them unless it can pull them. But as timropp said you'll probably find it's designed to charge at 1A (ac charger) or 500mA (usb). A 1A charger has some resistors on the data lines which tell the device that the charger can supply 1A. Without those whatever is connected is assumed to supply at most 500mA and the device limits itself to pulling that much.
grim82 said:
From a purely electrical stand point the amps is less important then the voltage. You simply always need a supply with more amps then your device will draw. Unlike voltage where you do not want to have a difference in the number as long as the amps number is higher you're fine. If you have extra amps it doesn't use them unless it can pull them. But as timropp said you'll probably find it's designed to charge at 1A (ac charger) or 500mA (usb). A 1A charger has some resistors on the data lines which tell the device that the charger can supply 1A. Without those whatever is connected is assumed to supply at most 500mA and the device limits itself to pulling that much.
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Resistors are not needed. I just solded the 2 USB data pins together and my Galaxy Nexus recognizes my car charger as a AC charger.
But unfortunately i don't think there is an app or variable that can tell me the actual amps the device gets from the charger.
Hello,
I have the following charger in my car. Can I use it to charge my Nexus6 ?
It has 10 Watts per port, 2 X 2.1A, 5V (voltage not sure).
http://www.belkin.com/my/IWCatProductPage.process?Product_Id=652450
Please suggest.
Thanks.
Why do you think you couldn't use it?
Sent from my Nexus 6
imnuts said:
Why do you think you couldn't use it?
Sent from my Nexus 6
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I thought of checking with you, if the output of that belkin (current, voltage etc.) matches with the Nexus6. I understand that the phone will draw only the current that it needs (1.6A) from the charger. But not sure about the Voltage. It doesn't show the voltage in the specs also. So is the Nexus6 support all ranges of voltage - 5V, 9V and 12V ?
Please suggest.
Thanks.
Well if it is a standard USB connection on the charger and works with other devices, you can bet that it is 5v.
graydiggy said:
Well if it is a standard USB connection on the charger and works with other devices, you can bet that it is 5v.
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Yes, mostly. I have this charger with me and don't want to buy another one, and I have 2 phones to charge while travelling in the car.
One question: Whether the Nexus6 support all ranges of voltage - 5V, 9V and 12V ? I have seen them printed on the inner side of the Turbo Charger. But want to know more about how it works.
Thanks.
The 9V/12V on the standard charger are for Qualcomm's Quick Charge. The phone will charge from a standard computer USB port outputting 5V/500mA (albeit very slowly) if you wanted to. The phone will draw as much power as the charger can output for a given voltage, up to the limits programmed into the kernel for the charging chip. Either the charger or the phone could be the rate limiter, but any charger that you can have a microUSB connection to plug into the phone should work.
As most of you probably know, the nexus 5x charger is 5v 3a.
I saw a power bank that support charging of 9v 2.4a.
my question is, will my nexus 5x use the 9v of the power bank to charge at the maximum speed it can, or will it only use 5v and it will be slower than the stock charger of the phone?
Thanks.
orma1 said:
As most of you probably know, the nexus 5x charger is 5v 3a.
I saw a power bank that support charging of 9v 2.4a.
my question is, will my nexus 5x use the 9v of the power bank to charge at the maximum speed it can, or will it only use 5v and it will be slower than the stock charger of the phone?
Thanks.
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USB specs are only for 5V, and that is what our phones use. If you use a higher voltage, it will fry your phone. However, some chargers use a scaling voltage to supply more power if the device supports it. For example, I just got an Acer R13 Chromebook that charges thru the USB-C port. The Power supply is rated for 45 Watts, but there's no way in hell it can run that at 5V without frying the cables. That would be 5V @ 9A! Instead, it caps out at 3A, and will scale the voltage up as needed. It goes from 5V&3A to 9V&3A to 15V&3A to 20V&2.25A. Because it starts at 5V and won't go any higher unless requested, I can use it to charge my 5x @ 5V&3A.
If your power bank starts at 5V and then ramps up to 9V if requested, it should be fine to use with the 5x, but you're limited to the 2.4A. If it starts at 9V, then you're going to fry your phone. Can you link to the charger so we can verify?
its a QC 3 certified charger and A2 supports QC 4+ right?
so wether it takes 9v 2a (18w) or 9v 3a (27w) to charge
https://store.mi.com/in/item/3192900008
and also want to know is it safe to use moto's turbo charger because its output is max 15w
candykala said:
its a QC 3 certified charger and A2 supports QC 4+ right?
so wether it takes 9v 2a (18w) or 9v 3a (27w) to charge
https://store.mi.com/in/item/3192900008
and also want to know is it safe to use moto's turbo charger because its output is max 15w
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In general terms, V×A = W. Now, voltage is pushed and current is pulled. So it doesn't matter what the Amp is, what matters is that the Voltage should not exceed the max specs. That is why Oppo's VOOC chargers are best suited. They keep volt at 5V while increasing the ampere to 3/4 Amp to increase Watt without damaging the phone.
candykala said:
its a QC 3 certified charger and A2 supports QC 4+ right?
so wether it takes 9v 2a (18w) or 9v 3a (27w) to charge
https://store.mi.com/in/item/3192900008
and also want to know is it safe to use moto's turbo charger because its output is max 15w
Click to expand...
Click to collapse
Qualcomm's quick charge technology is backward compatible. So a QC4+ supporting device will happily work with a QC 3 charger.
Also, QC 4+ technology is design to withstand upto 20v and upto 4.6Amps (not at the same time) and at the same time QC 4 and 4+ are no different the specifications there are same there is only some internal changes.
QC 4 achieves 27w not via the QC technology but it uses USB-PD which is a universal technology released on 2012 and unlike QC it's not proprietary Qualcomm's tech. USB-PD for our device works in the range of 3-11V and 0-3A.
Also, charging current and voltage is controlled by the device, not the charger. You can safely charge your phone using a MacBook charger which can provide upto 60w of power and it won't harm your phone.
#tldr : yes it's totally safe to use any charger with your phone. Unless it's not a cheap one which doesn't comply to basic quality standards you are good to go.
Hello
Can i use the samaung 9v 1.5A for my xiaomi mi a2 because phone came with 5V 2A , can this samsung original charger damage my phone ?
So I was trying to charge as fast as possible and multiple qc2 and 3 chargers were only slow charging. I assume this is due to the unisoc vs Qualcomm chipset. I was able to determine that pd chargers will quick charge at nearly 15 W. But only Samsung chargers with afc and one anker, with iq2 I think, will charge at non pd high speed charging
Use a known good Samsung 25w brick/cable to simplify troubleshooting... it's hard enough to begin with.
If battery start charge temp is <65F or >100F or has greater than a 75% charge on it, fast charging may be disabled. Display must be off.
Edit <oops>
I have an Rd tc-66 so I can see exactly what volt/amp/watt is being supplied. I used an anker, aukey, and several other chargers. Only the Samsung fast charger, the anker and any pd charger I tried were able to fast charge. I used 1 USB a to c cable for all chargers, so it worked on 2 qc chargers and not on 4 qc2 and qc3 chargers. For pd chargers, it was the same c to c cable, and all pd chargers provided 8-9v and 1.4-1.7a.
My quess, again, is that the unisoc chipset doesn't favor Qualcomm quick charge, so it's limited to Samsung afc and pd for high speed charging.